Fantastic model!
NSB added buffers so that they could make two 3-unit locomotives from three 2-unit locomotives.
This was in order to meet increasing train weights.
The same method had been used by both NSB and SJ on older locomotives also.
SJ and NSB choose different paths on EL12/Dm as SJ instead ordered new cabin less units type Dm3 to use with the older Dm units.
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